https://www.bleepingcomputer.com/news/microsoft/windows-10-screen-sketch-app-renamed-to-snip-and-sketch-in-insider-builds/

For Windows Insiders in the Skip Ahead ring, Microsoft has renamed their Windows 10 Screen Sketch app to Snip & Sketch.  This new build is not available to users running Windows 10 April 2018 Update or the latest Windows 10 Preview build 17741.